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What is A6266?

This electronic component, produced by the manufacturer "Allegro MicroSystems", performs the same function as "High Current LED Controller".


A6266 Datasheet PDF - Allegro MicroSystems

Part Number A6266
Description High Current LED Controller
Manufacturers Allegro MicroSystems 
Logo Allegro MicroSystems Logo 


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A6266
Automotive, Boost, High Current LED Controller
Features and Benefits
AEC Q100 Grade 0 Automotive Qualified
Constant current LED drive
5 to 50 V supply
Boost mode
Drives up to 15 LEDs in series
Programmable switching frequency 100 to 700 kHz
Open LED overvoltage indication and protection
Single and multiple LED short indication
LED short to ground and supply protection
PWM dimming control
Applications:
Automotive high power LED lighting systems
Fog lights, reversing lights, daytime running lights
Headlights
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Description
The A6266 is a boost converter controller, providing a
programmable constant current output for driving high power
LEDs in series. Driving the LEDs in series ensures identical
currents and uniform brightness. For automotive applications,
optimum performance is achieved when driving up to 15 LEDs
at currents up to 1 A.
TheA6266 provides a cost-effective solution using an external
logic-level MOSFET and minimum additional external
components. The maximum LED current is set with a single
external sense resistor and can be modified using a current
reference input. Direct PWM control is possible via the Enable
input, which also provides a shutdown mode.
Integrated diagnostics and two fault outputs give indication of
undervoltage, chip overtemperature, output open circuit, LED
short circuit and LED undercurrent, and can be configured to
provide short to supply and short to ground protection for the
LED connections. A unique feature is the ability to detect one
or more shorted LEDs.
The device is provided in a 16-pinTSSOPpackage with exposed
thermal pad (suffix LP). It is lead (Pb) free, with 100% matte
tin leadframe plating.
Not to scale
Typical Application Diagram
12 V or 24 V (50 V max)
Power net
Boost Mode
VBAT(min)
(V)
Maximum
Quantity of
LEDs
6 10
7 12
8 13
9 15
Vf of each LED = 3.5 V,
VBAT measured at VIN pin
D = 85%
Fault
Flags
Enable
VIN
VREG
LN
LP
FF1
FF2
A6266 LF
EN
SG
IREF
CKOUT
SP
OSC
GND
SN
LA
A6266-DS, Rev. 1
Datasheet pdf - http://www.DataSheet4U.net/

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A6266 equivalent
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A6266
Automotive, Boost, High Current LED Controller
ELECTRICAL CHARACTERISTICS1 Valid at TJ = –40°C to 150°C, VIN = 6 to 40 V; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Supply and Reference
VIN Functional Operating Range2
VIN Quiescent Current
VREG Output Voltage
Gate Output Drive
IINQ
IINS
VREG
SG open circuit
EN = GND
IREG = 0 to 2 mA
5–
––
–4
4.75 5
Turn-On Time
Turn-Off Time
Maximum Duty Cycle
Pull-Up On Resistance
Pull-Down On Resistance
Output High Voltage
tr
tf
D
RDS(on)UP
RDS(on)DN
CLOAD = 1 nF, 20% to 80%
CLOAD = 1 nF, 80% to 20%
tON × fOSC
TJ = 25°C, IGHx = –100 mA
TJ = 150°C, IGHx = –100 mA
TJ = 25°C, IGLx = 100 mA
TJ = 150°C, IGLx = 100 mA
VSGH ISG = –100 μA
80
VREG
0.1
35
35
85
1.7
1
Output Low Voltage
Logic Inputs and Outputs
VSGL
ISG = 100 μA
––
Fault Output (Open Drain)
Fault Output FF1 Sink Current1
Fault Output FF1 Leakage Current1
Fault Output FF2 Leakage Current1
Input Low Voltage
Input High Voltage
Input Hysteresis
Enable Input Internal Clamp Voltage
Enable Input Current Limit Resistor
Disable Time
Oscillator
VOL
IOH(snk)
IOH1(lkg)
IOH2(lkg)
VIL
VIH
VIhys
VENC
REN
tDIS
IOL = 1 mA, fault not asserted
0.4 V < VO < 50 V, fault not asserted
VO = 12 V, fault asserted
VO = 5 V, fault asserted
Between EN and internal clamp
fOSC = 350 kHz
––
– 1.3
–1 –
–5 –
––
2–
225 330
– 8.4
– 200
– 94
Oscillator Frequency
OSC Pin Voltage
CKOUT Output Delay
OSC Input Low Voltage
OSC Input High Voltage
OSC Input Hysteresis
fOSC
VOSC
tDC
VOIL
VOIH
VOihys
ROSC = 43 kΩ
ROSC = 62 kΩ
ROSC = VREG
ROSC = 62 kΩ
OSC input rise to CKOUT rise
– 500
315 350
– 350
1.15 1.2
– 150
––
3.5 –
300 600
Max.
50
8
10
5.25
3.5
2
VREG
0.1
0.4
1
5
0.8
385
1.25
0.8
Unit
V
mA
μA
V
ns
ns
%
Ω
Ω
Ω
Ω
V
V
V
mA
μA
μA
V
V
mV
V
kΩ
ms
kHz
kHz
kHz
V
ns
V
V
mV
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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